Fixed typo in CircuitBreaker basic demo docu
Fixed typo in CircuitBreaker basic demo docu

Corrected  name of supplier variable in documentation
mehtabsinghmann/resilience4j,javaslang/javaslang-circuitbreaker,resilience4j/resilience4j,goldobin/resilience4j,resilience4j/resilience4j,RobWin/javaslang-circuitbreaker,drmaas/resilience4j,drmaas/resilience4j,RobWin/circuitbreaker-java8